<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>IFrame</title>
</head>
<body>
<div id="modal">
    <iframe id="buttonframe" name="myframe" src="https://seleniumhq.github.io" width="1000" height="900">
        <button>Click here</button>
    </iframe>
</div>
</body>
</html>